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<a href="concurrent__task__loop_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="concurrent__task__loop_8hpp.html">flow/async/concurrent_task_loop.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;flow/error/error.hpp&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#ifdef FLOW_OS_MAC</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#  if 0 </span><span class="comment">// That code is disabled at the moment (see below).</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#    include &lt;mach/thread_policy.h&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#    include &lt;mach/thread_act.h&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#  endif</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1async.html">flow::async</a></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>{</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// Method implementations.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><a class="code hl_function" href="classflow_1_1async_1_1Concurrent__task__loop.html#a7b9123d43e1cfae899b0e1bb52bb6dde">Concurrent_task_loop::~Concurrent_task_loop</a>() = <span class="keywordflow">default</span>; <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment">// Free function implementations.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"><a class="line" href="namespaceflow_1_1async.html#adab04f47b40b92fffbe12bc33fadd223">   37</a></span><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_function" href="namespaceflow_1_1async.html#adab04f47b40b92fffbe12bc33fadd223">optimal_worker_thread_count_per_pool</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr,</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>                                                  <span class="keywordtype">bool</span> est_hw_core_sharing_helps_algo)</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>{</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>  <a class="code hl_define" href="log_8hpp.html#ae4b5d4fdd2eb052615620879dd74af95">FLOW_LOG_SET_CONTEXT</a>(logger_ptr, Flow_log_component::S_ASYNC);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n_phys_cores = Thread::physical_concurrency();</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n_logic_cores = Thread::hardware_concurrency();</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> core_sharing_supported = n_phys_cores != n_logic_cores;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;System reports processor with [&quot;</span> &lt;&lt; n_phys_cores &lt;&lt; <span class="stringliteral">&quot;] physical cores; and &quot;</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>                <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; n_logic_cores &lt;&lt; <span class="stringliteral">&quot;] hardware threads a/k/a logical cores; core sharing (a/k/a &quot;</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>                <span class="stringliteral">&quot;hyper-threading) is &quot;</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>                <span class="stringliteral">&quot;thus [&quot;</span> &lt;&lt; (core_sharing_supported ? <span class="stringliteral">&quot;supported&quot;</span> : <span class="stringliteral">&quot;unsupported&quot;</span>) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>  <span class="keywordflow">if</span> (!core_sharing_supported)</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  {</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Core sharing is [unsupported].  &quot;</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>                  <span class="stringliteral">&quot;Therefore suggested thread pool thread count is &quot;</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>                  <span class="stringliteral">&quot;simply the logical core count = [&quot;</span> &lt;&lt; n_logic_cores &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>    <span class="keywordflow">return</span> n_logic_cores;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>  }</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  <span class="comment">// else if (n_phys_cores != n_logic_cores)</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>  <span class="keywordflow">if</span> (est_hw_core_sharing_helps_algo)</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>  {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Application estimates this thread pool DOES benefit from 2+ hardware threads sharing physical &quot;</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>                  <span class="stringliteral">&quot;processor core (a/k/a hyper-threading); therefore we shall act as if there is 1 hardware thread &quot;</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>                  <span class="stringliteral">&quot;a/k/a logical core per physical core, even though in reality above shows it is [supported].  &quot;</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>                  <span class="stringliteral">&quot;Therefore suggested thread pool thread count is &quot;</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>                  <span class="stringliteral">&quot;simply the logical core count = [&quot;</span> &lt;&lt; n_logic_cores &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>    <span class="keywordflow">return</span> n_logic_cores;</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>  }</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Application estimates this thread pool does NOT benefit from 2+ hardware threads sharing physical &quot;</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>                <span class="stringliteral">&quot;processor core (a/k/a hyper-threading); &quot;</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>                <span class="stringliteral">&quot;therefore suggested thread pool thread count is &quot;</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>                <span class="stringliteral">&quot;simply the physical core count = [&quot;</span> &lt;&lt; n_phys_cores &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>  <span class="keywordflow">return</span> n_phys_cores;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>} <span class="comment">// optimal_worker_thread_count_per_pool()</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"><a class="line" href="namespaceflow_1_1async.html#a3e200db7e5375de21d2568004a85dcad">   80</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1async.html#a3e200db7e5375de21d2568004a85dcad">optimize_pinning_in_thread_pool</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr,</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>                                     <span class="keyword">const</span> std::vector&lt;util::Thread*&gt;&amp; threads_in_pool,</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>                                     <span class="keywordtype">bool</span> est_hw_core_sharing_helps_algo,</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>                                     <span class="keywordtype">bool</span> est_hw_core_pinning_helps_algo,</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>                                     <span class="keywordtype">bool</span> hw_threads_is_grouping_collated,</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>                                     <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code)</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>{</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>  <span class="keywordflow">if</span> (<a class="code hl_function" href="namespaceflow_1_1error.html#a48afa7f8c2e100acd461365dfb00a114">flow::error::exec_void_and_throw_on_error</a></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>        ([&amp;](<a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* actual_err_code)</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>           { <a class="code hl_function" href="namespaceflow_1_1async.html#a3e200db7e5375de21d2568004a85dcad">optimize_pinning_in_thread_pool</a>(logger_ptr, threads_in_pool, est_hw_core_sharing_helps_algo,</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>                                             est_hw_core_pinning_helps_algo, hw_threads_is_grouping_collated,</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>                                             actual_err_code); },</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>         err_code, <span class="stringliteral">&quot;flow::async::optimize_pinning_in_thread_pool()&quot;</span>))</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>  {</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>  }</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  <span class="comment">// else if (err_code):</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>  err_code-&gt;clear();</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span> </div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>  <span class="comment">/* There are 2 ways (known to us) to set thread-core affinity.  In reality they are mutually exclusive (one is Mac,</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   * other is Linux), but conceptually they could co-exist.  With the latter in mind, note the subtlety that we choose</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   * the Linux way over the Mac way, had they both been available.  The Mac way doesn&#39;t rely on specifying a hardware</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   * thread index, hence it needs to make no assumptions about the semantics of which threads share which cores, and</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * for this and related reasons it&#39;s actually superior to the Linux way.  The reason we choose the inferior Linux</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   * way in that case is &quot;thin,&quot; but it&#39;s this: per</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   * https://developer.apple.com/library/archive/releasenotes/Performance/RN-AffinityAPI</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   * the affinity tags are not shared between separate processes (except via fork() after the first affinity API call,</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   * which we probably could do if it came down to it, but it almost certainly won&#39;t).  So in the rare case where</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   * it&#39;d help performance that a &quot;producer thread&quot; is pinned to the same hardware core as a &quot;consumer thread,&quot; the</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   * Linux way lets one easily do this, whereas the Mac way doesn&#39;t (except via the fork() thing).  In our case,</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   * the pinning is about avoiding the NEGATIVE implications of core sharing, but there could be POSITIVE</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   * implications in some cases.  So in that case it&#39;s nice to pin those to the same</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * core which will indeed occur in the Linux algorithm below. */</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>  <span class="keyword">static_assert</span>(<a class="code hl_define" href="concurrent__task__loop_8hpp.html#abdde86e8129cc056ef4c7dc2cafca8a7">FLOW_ASYNC_HW_THREAD_AFFINITY_PTHREAD_VIA_CORE_IDX</a> || <a class="code hl_define" href="concurrent__task__loop_8hpp.html#acfbcdb498fb2ebbeae127cb5a777bb29">FLOW_ASYNC_HW_THREAD_AFFINITY_MACH_VIA_POLICY_TAG</a>,</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>                <span class="stringliteral">&quot;We only know how to deal with thread-core affinities in Darwin/Mac and Linux.&quot;</span>);</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>  <span class="keyword">using </span>boost::system::system_category;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>  <span class="keyword">using </span>std::runtime_error;</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>  <span class="keyword">using </span><a class="code hl_function" href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">util::ostream_op_string</a>;</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>;</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  <a class="code hl_define" href="log_8hpp.html#ae4b5d4fdd2eb052615620879dd74af95">FLOW_LOG_SET_CONTEXT</a>(logger_ptr, Flow_log_component::S_ASYNC);</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span> </div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>  <span class="keywordflow">if</span> (!est_hw_core_pinning_helps_algo)</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>  {</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Application estimates the logic in this thread pool would not benefit from pinning threads to &quot;</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>                  <span class="stringliteral">&quot;processor cores; therefore letting system control assignment of threads to processor cores.&quot;</span>);</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>  }</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>  assert(est_hw_core_pinning_helps_algo);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span> </div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>  <span class="comment">// This mode only works if we started in this mode earlier when determing # of threads in pool.  @todo assert()?</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>  <span class="keyword">const</span> <span class="keyword">auto</span> n_pool_threads = threads_in_pool.size();</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>  assert(n_pool_threads == <a class="code hl_function" href="namespaceflow_1_1async.html#adab04f47b40b92fffbe12bc33fadd223">optimal_worker_thread_count_per_pool</a>(get_logger(), est_hw_core_sharing_helps_algo));</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span> </div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>  <span class="keyword">const</span> <span class="keyword">auto</span> n_logic_cores_per_pool_thread = Thread::hardware_concurrency() / n_pool_threads;</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Application estimates thread pool would benefit from pinning threads to processor cores; &quot;</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>                <span class="stringliteral">&quot;will set affinities as follows below.  &quot;</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>                <span class="stringliteral">&quot;Thread count in pool is [&quot;</span> &lt;&lt; n_pool_threads &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>                <span class="stringliteral">&quot;at [&quot;</span> &lt;&lt; n_logic_cores_per_pool_thread &lt;&lt; <span class="stringliteral">&quot;] logical processor cores each.&quot;</span>);</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span> </div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> thread_idx = 0; thread_idx != n_pool_threads; ++thread_idx)</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>  {</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>    <a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">Thread</a>* thread = threads_in_pool[thread_idx];</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>    <span class="keyword">const</span> <span class="keyword">auto</span> native_pthread_thread_id = thread-&gt;native_handle();</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="preprocessor">#if FLOW_ASYNC_HW_THREAD_AFFINITY_PTHREAD_VIA_CORE_IDX</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>    using ::cpu_set_t;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    using ::pthread_setaffinity_np;</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>    cpu_set_t cpu_set_for_thread;</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>    CPU_ZERO(&amp;cpu_set_for_thread);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> logical_core_idx_given_thread_idx = 0;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>         logical_core_idx_given_thread_idx != n_logic_cores_per_pool_thread;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>         ++logical_core_idx_given_thread_idx)</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>    {</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>      <span class="comment">/* (If you&#39;re confused, suggest first looking at doc header&#39;s explanation of hw_threads_is_grouping_collated.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">       * Also consider classic example configuration with 8 hardware threads, 4 physical threads, and</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">       * !hw_threads_is_grouping_collated, resulting in system hardware thread indexing 01230123.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">       * Or if hw_threads_is_grouping_collated, then it&#39;s 00112233.) */</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>      <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> native_logical_core_id</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>        = hw_threads_is_grouping_collated ? ((thread_idx * n_logic_cores_per_pool_thread)</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>                                             + logical_core_idx_given_thread_idx)</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>                                          : ((logical_core_idx_given_thread_idx * n_pool_threads)</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>                                             + thread_idx);</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>      <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Thread [&quot;</span> &lt;&lt; thread_idx &lt;&lt; <span class="stringliteral">&quot;] in pool: adding affinity for &quot;</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>                    <span class="stringliteral">&quot;logical core/hardware thread [&quot;</span> &lt;&lt; native_logical_core_id &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span> </div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>      CPU_SET(native_logical_core_id, &amp;cpu_set_for_thread);</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>    }</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>    <span class="keyword">const</span> <span class="keyword">auto</span> code = pthread_setaffinity_np(native_pthread_thread_id, <span class="keyword">sizeof</span>(cpu_set_for_thread), &amp;cpu_set_for_thread);</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>    <span class="keywordflow">if</span> (code == -1)</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>    {</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>      <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a> sys_err_code{errno, system_category()};</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>      <a class="code hl_define" href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a>(); <span class="comment">// Log non-portable error.</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>      *err_code = sys_err_code;</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>    }</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>    <span class="comment">// else OK!</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="preprocessor">#else </span><span class="comment">// if FLOW_ASYNC_HW_THREAD_AFFINITY_MACH_VIA_POLICY_TAG</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span> </div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>    <span class="keyword">static_assert</span>(<span class="keyword">false</span>, <span class="stringliteral">&quot;This strongly platform-dependent function has not been properly tested and maintained &quot;</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>                           <span class="stringliteral">&quot;for Darwin/Mac in a long time, as Flow has been Linux-only for many years.  &quot;</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>                           <span class="stringliteral">&quot;There is also a likely (documented, known) bug in this impl.  Please revisit when &quot;</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>                           <span class="stringliteral">&quot;we re-add Mac/Darwin support.&quot;</span>)</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span>#  <span class="keywordflow">if</span> 0</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>    <span class="comment">/* Maintenance note: When/if re-enabling this Darwin/Mac section:</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">     *   - Resolve the likely bug noted in below @todo.</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">     *   - Update the code to generate an Error_code even on the Mach error (will need to make a new Error_code</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">     *     category, in flow.async; which is no big deal; we do that all the time; or if there is one out there</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">     *     for these Mach errors specifically, then use that).</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">     *   - Update the code assign to *err_code, not throw (the rest of the function now acts this way, per standard</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">     *     Flow semantics).</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">     *   - Test, test, test... Mac, ARM64... all that. */</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span> </div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>    using ::pthread_mach_thread_np;</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>    using ::thread_affinity_policy_data_t;</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>    using ::thread_policy_set;</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>    <span class="comment">// using ::THREAD_AFFINITY_POLICY; // Nope; it&#39;s a #define.</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span> </div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>    <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> native_affinity_tag = 1 + thread_idx;</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Thread [&quot;</span> &lt;&lt; thread_idx &lt;&lt; <span class="stringliteral">&quot;] in pool: setting Mach affinity tag [&quot;</span> &lt;&lt; native_affinity_tag &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span> </div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span>    <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a> sys_err_code;</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>    <span class="keyword">const</span> <span class="keyword">auto</span> native_mach_thread_id = pthread_mach_thread_np(native_pthread_thread_id);</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span>    <span class="keywordflow">if</span> (native_pthread_thread_id == 0)</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>    {</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>      <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a> sys_err_code(errno, system_category()); <span class="comment">// As above....</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span>      <a class="code hl_define" href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a>();</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>      <span class="keywordflow">throw</span> <a class="code hl_class" href="classflow_1_1error_1_1Runtime__error.html">error::Runtime_error</a>(sys_err_code, <span class="stringliteral">&quot;pthread_mach_thread_np() call in optimize_pinning_in_thread_pool()&quot;</span>);</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>    }</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;pthread ID [&quot;</span> &lt;&lt; native_pthread_thread_id &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>                   <span class="stringliteral">&quot;&lt;=&gt; Mach thread ID [&quot;</span> &lt;&lt; native_mach_thread_id &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span> </div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span>    <span class="comment">/* @todo CAUTION! There may be a bug here.  The (Darwin-specific) documentation</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">     * https://developer.apple.com/library/archive/releasenotes/Performance/RN-AffinityAPI/</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">     * recommends one create the thread, then set its affinity, and only THEN run the thread.</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">     * The Boost (and the derived STL equivalent) thread lib does not allow one to create a thread in suspended state;</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">     * pthread_create_suspended_np() does but isn&#39;t accessible (and seemingly is a barely-documented Darwin thing</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">     * not available in Linux, though the present code is Mac anyway) nor possible to somehow splice into the</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">     * boost::thread ctor&#39;s execution.  We can&#39;t/shouldn&#39;t abandon the thread API, so we are stuck.</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">     * Now, when it *recommends* it, does it actually require it?  The wording seems to imply &quot;no&quot;... but</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">     * there is no guarantee.  Empirically speaking, when trying it out, it&#39;s unclear (via cpu_idx() calls elsewhere</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">     * in this file) whether Darwin&#39;s listening to us.  It definitely keeps migrating the threads back and forth,</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">     * which MIGHT suggest it&#39;s not working, as the doc claims setting an affinity tag would &quot;tend&quot; to reduce migration</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">     * (but how much, and what does &quot;tend&quot; mean?).  The to-do is to resolve this; but it is low-priority, because</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">     * in reality we care about Linux only and do the Mac thing for completeness only, in this PoC.</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">     *</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span><span class="comment">     * There&#39;s an official @todo in our doc header, and it refers to this text and code. */</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span> </div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span>    thread_affinity_policy_data_t native_thread_policy_data{ int(native_affinity_tag) }; <span class="comment">// Cannot be const due to API.</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>    <span class="keyword">const</span> <span class="keyword">auto</span> code = thread_policy_set(native_mach_thread_id, THREAD_AFFINITY_POLICY,</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>                                        <span class="comment">// The evil cast is necessary given the Mach API design.  At least they&#39;re ptrs.</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>                                        <span class="keyword">reinterpret_cast&lt;</span>thread_policy_t<span class="keyword">&gt;</span>(&amp;native_thread_policy_data), 1);</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>    <span class="keywordflow">if</span> (code != 0)</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>    {</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span>      <span class="comment">/* I don&#39;t know/understand Mach error code system, and there are no `man` pages as such that I can find</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">       * (including on Internet) -- though brief kernel code perusal suggests fairly strongly it&#39;s not simply errno</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">       * here -- so let&#39;s just save the numeric code in a general runtime error exception string; hence do not</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">       * use Error_code-taking Runtime_exception as we would normally for a nice message.  @todo If we wanted</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">       * to we could make a whole boost.system error category for these Mach errors, etc. etc.  Maybe someone has.</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">       * Maybe Boost has!  Who knows?  We don&#39;t care about this corner case at the moment and doubtful if ever will.</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">       * @todo For sure though should use error::Runtime_error here, the ctor that takes no Error_code.</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">       * That ctor did not exist when the present code was written; as of this writing Flow is Linux-only.</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">       * Would do it right now but lack the time to verify any changes for Mac at the moment. */</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>      <span class="keywordflow">throw</span> runtime_error(<a class="code hl_function" href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">ostream_op_string</a>(<span class="stringliteral">&quot;[MACH_KERN_RETURN_T:&quot;</span>, code,</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span>                                            <span class="stringliteral">&quot;] [thread_policy_set(THREAD_AFFINITY_POLICY) failed]&quot;</span>));</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>    }</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>    <span class="comment">// else OK!</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="preprocessor">#  endif </span><span class="comment">// if 0</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span>  } <span class="comment">// for (thread_idx in [0, n_pool_threads))</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span>} <span class="comment">// optimize_pinning_in_thread_pool()</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span> </div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"><a class="line" href="namespaceflow_1_1async.html#a7fa5292ae2e7dddd11a7fe5228b1e574">  261</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1async.html#a7fa5292ae2e7dddd11a7fe5228b1e574">reset_thread_pinning</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr, <a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>* thread_else_ours, <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code)</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span>{</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>  <span class="keywordflow">if</span> (<a class="code hl_function" href="namespaceflow_1_1error.html#a48afa7f8c2e100acd461365dfb00a114">flow::error::exec_void_and_throw_on_error</a></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span>        ([&amp;](<a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* actual_err_code) { <a class="code hl_function" href="namespaceflow_1_1async.html#a7fa5292ae2e7dddd11a7fe5228b1e574">reset_thread_pinning</a>(logger_ptr, thread_else_ours, actual_err_code); },</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>         err_code, <span class="stringliteral">&quot;flow::async::reset_thread_pinning()&quot;</span>))</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>  {</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span>  }</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>  <span class="comment">// else if (err_code):</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span>  err_code-&gt;clear();</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span> </div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>;</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>  <span class="keyword">using </span>boost::system::system_category;</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span> </div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>  <span class="keyword">static_assert</span>(<a class="code hl_define" href="concurrent__task__loop_8hpp.html#abdde86e8129cc056ef4c7dc2cafca8a7">FLOW_ASYNC_HW_THREAD_AFFINITY_PTHREAD_VIA_CORE_IDX</a>,</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>                <span class="stringliteral">&quot;For this function we only know how to deal with thread-core affinities in Linux.&quot;</span>);</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span> </div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>  using ::cpu_set_t;</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>  using ::pthread_setaffinity_np;</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>  using ::pthread_self;</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span> </div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span>  <a class="code hl_define" href="log_8hpp.html#ae4b5d4fdd2eb052615620879dd74af95">FLOW_LOG_SET_CONTEXT</a>(logger_ptr, Flow_log_component::S_ASYNC);</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span> </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>  <span class="keyword">const</span> <span class="keyword">auto</span> native_pthread_thread_id = thread_else_ours ? thread_else_ours-&gt;native_handle()</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>                                                           <span class="comment">// `man` -v- page says, &quot;This function always succeeds.&quot;</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>                                                         : pthread_self();</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>  cpu_set_t cpu_set_for_thread;</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>  CPU_ZERO(&amp;cpu_set_for_thread);</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span> </div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n_logic_cores = Thread::hardware_concurrency();</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> logic_core_idx = 0; logic_core_idx != n_logic_cores; ++logic_core_idx)</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span>  {</div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span>    CPU_SET(logic_core_idx, &amp;cpu_set_for_thread);</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>  }</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span> </div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Thread with native ID [&quot;</span> &lt;&lt; native_pthread_thread_id &lt;&lt; <span class="stringliteral">&quot;]: resetting processor-affinity, &quot;</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>                <span class="stringliteral">&quot;so that no particular core is preferred for this thread.  (This may have already been the case.)&quot;</span>);</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span> </div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>  <span class="keywordflow">if</span> (pthread_setaffinity_np(native_pthread_thread_id, <span class="keyword">sizeof</span>(cpu_set_for_thread), &amp;cpu_set_for_thread) == -1)</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span>  {</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>    <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a> sys_err_code{errno, system_category()};</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span>    <a class="code hl_define" href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a>(); <span class="comment">// Log non-portable error.</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span>    *err_code = sys_err_code;</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>  }</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>  <span class="comment">// else OK!</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>} <span class="comment">// reset_thread_pinning()</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span> </div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"><a class="line" href="namespaceflow_1_1async.html#a227e64eb71ec278f19d679d8411db627">  309</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1async.html#a227e64eb71ec278f19d679d8411db627">reset_this_thread_pinning</a>() <span class="comment">// I know this looks odd and pointless; but see our doc header.</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>{</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>  <a class="code hl_function" href="namespaceflow_1_1async.html#a7fa5292ae2e7dddd11a7fe5228b1e574">reset_thread_pinning</a>();</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>}</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span> </div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>} <span class="comment">// namespace flow::async</span></div>
<div class="ttc" id="aclassflow_1_1async_1_1Concurrent__task__loop_html_a7b9123d43e1cfae899b0e1bb52bb6dde"><div class="ttname"><a href="classflow_1_1async_1_1Concurrent__task__loop.html#a7b9123d43e1cfae899b0e1bb52bb6dde">flow::async::Concurrent_task_loop::~Concurrent_task_loop</a></div><div class="ttdeci">~Concurrent_task_loop() override</div><div class="ttdoc">Any implementing subclass's destructor shall execute stop() – see its doc header please – and then cl...</div></div>
<div class="ttc" id="aclassflow_1_1error_1_1Runtime__error_html"><div class="ttname"><a href="classflow_1_1error_1_1Runtime__error.html">flow::error::Runtime_error</a></div><div class="ttdoc">An std::runtime_error (which is an std::exception) that stores an Error_code.</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00047">error.hpp:49</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aconcurrent__task__loop_8hpp_html"><div class="ttname"><a href="concurrent__task__loop_8hpp.html">concurrent_task_loop.hpp</a></div></div>
<div class="ttc" id="aconcurrent__task__loop_8hpp_html_abdde86e8129cc056ef4c7dc2cafca8a7"><div class="ttname"><a href="concurrent__task__loop_8hpp.html#abdde86e8129cc056ef4c7dc2cafca8a7">FLOW_ASYNC_HW_THREAD_AFFINITY_PTHREAD_VIA_CORE_IDX</a></div><div class="ttdeci">#define FLOW_ASYNC_HW_THREAD_AFFINITY_PTHREAD_VIA_CORE_IDX</div><div class="ttdoc">Macro set to 1 (else 0) if and only if natively the pthread API allows one to set thread-to-core affi...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8hpp_source.html#l00656">concurrent_task_loop.hpp:656</a></div></div>
<div class="ttc" id="aconcurrent__task__loop_8hpp_html_acfbcdb498fb2ebbeae127cb5a777bb29"><div class="ttname"><a href="concurrent__task__loop_8hpp.html#acfbcdb498fb2ebbeae127cb5a777bb29">FLOW_ASYNC_HW_THREAD_AFFINITY_MACH_VIA_POLICY_TAG</a></div><div class="ttdeci">#define FLOW_ASYNC_HW_THREAD_AFFINITY_MACH_VIA_POLICY_TAG</div><div class="ttdoc">Macro set to 1 (else 0) if and only if natively there is Mach kernel API that allows to set thread-to...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8hpp_source.html#l00668">concurrent_task_loop.hpp:668</a></div></div>
<div class="ttc" id="aerror_2error_8hpp_html_a019ee6e90802e444572dd78d312d6e23"><div class="ttname"><a href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a></div><div class="ttdeci">#define FLOW_ERROR_SYS_ERROR_LOG_WARNING()</div><div class="ttdoc">Logs a warning about the (often errno-based or from a library) error code in sys_err_code.</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00269">error.hpp:269</a></div></div>
<div class="ttc" id="alog_8hpp_html_a325fdd4b5cf0be49b37d3b7b7c29070d"><div class="ttname"><a href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a></div><div class="ttdeci">#define FLOW_LOG_INFO(ARG_stream_fragment)</div><div class="ttdoc">Logs an INFO message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00197">log.hpp:197</a></div></div>
<div class="ttc" id="alog_8hpp_html_ae4b5d4fdd2eb052615620879dd74af95"><div class="ttname"><a href="log_8hpp.html#ae4b5d4fdd2eb052615620879dd74af95">FLOW_LOG_SET_CONTEXT</a></div><div class="ttdeci">#define FLOW_LOG_SET_CONTEXT(ARG_logger_ptr, ARG_component_payload)</div><div class="ttdoc">For the rest of the block within which this macro is instantiated, causes all FLOW_LOG_....</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00405">log.hpp:405</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html"><div class="ttname"><a href="namespaceflow_1_1async.html">flow::async</a></div><div class="ttdoc">Flow module containing tools enabling multi-threaded event loops operating under the asynchronous-tas...</div><div class="ttdef"><b>Definition:</b> <a href="async__fwd_8hpp_source.html#l00074">async_fwd.hpp:75</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_a227e64eb71ec278f19d679d8411db627"><div class="ttname"><a href="namespaceflow_1_1async.html#a227e64eb71ec278f19d679d8411db627">flow::async::reset_this_thread_pinning</a></div><div class="ttdeci">void reset_this_thread_pinning()</div><div class="ttdoc">Resets processor-affinity of the calling thread; does not log; and throws on extremely unlikely syste...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8cpp_source.html#l00309">concurrent_task_loop.cpp:309</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_a3e200db7e5375de21d2568004a85dcad"><div class="ttname"><a href="namespaceflow_1_1async.html#a3e200db7e5375de21d2568004a85dcad">flow::async::optimize_pinning_in_thread_pool</a></div><div class="ttdeci">void optimize_pinning_in_thread_pool(log::Logger *logger_ptr, const std::vector&lt; util::Thread * &gt; &amp;threads_in_pool, bool est_hw_core_sharing_helps_algo, bool est_hw_core_pinning_helps_algo, bool hw_threads_is_grouping_collated, Error_code *err_code=nullptr)</div><div class="ttdoc">Assuming the same situation as documented for optimal_worker_thread_count_per_pool(),...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8cpp_source.html#l00080">concurrent_task_loop.cpp:80</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_a7fa5292ae2e7dddd11a7fe5228b1e574"><div class="ttname"><a href="namespaceflow_1_1async.html#a7fa5292ae2e7dddd11a7fe5228b1e574">flow::async::reset_thread_pinning</a></div><div class="ttdeci">void reset_thread_pinning(log::Logger *logger_ptr=nullptr, util::Thread *thread_else_ours=nullptr, Error_code *err_code=nullptr)</div><div class="ttdoc">Resets the processor-affinity of the given thread – or calling thread – to be managed as the OS deems...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8cpp_source.html#l00261">concurrent_task_loop.cpp:261</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_adab04f47b40b92fffbe12bc33fadd223"><div class="ttname"><a href="namespaceflow_1_1async.html#adab04f47b40b92fffbe12bc33fadd223">flow::async::optimal_worker_thread_count_per_pool</a></div><div class="ttdeci">unsigned int optimal_worker_thread_count_per_pool(log::Logger *logger_ptr, bool est_hw_core_sharing_helps_algo)</div><div class="ttdoc">Assuming a planned thread pool will be receiving ~symmetrical load, and its UX-affecting (in particul...</div><div class="ttdef"><b>Definition:</b> <a href="concurrent__task__loop_8cpp_source.html#l00037">concurrent_task_loop.cpp:37</a></div></div>
<div class="ttc" id="anamespaceflow_1_1error_html_a48afa7f8c2e100acd461365dfb00a114"><div class="ttname"><a href="namespaceflow_1_1error.html#a48afa7f8c2e100acd461365dfb00a114">flow::error::exec_void_and_throw_on_error</a></div><div class="ttdeci">bool exec_void_and_throw_on_error(const Func &amp;func, Error_code *err_code, util::String_view context)</div><div class="ttdoc">Equivalent of exec_and_throw_on_error() for operations with void return type.</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00168">error.hpp:168</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a685b86585da2fa5186f51854e7ae1561"><div class="ttname"><a href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">flow::util::ostream_op_string</a></div><div class="ttdeci">std::string ostream_op_string(T const &amp;... ostream_args)</div><div class="ttdoc">Equivalent to ostream_op_to_string() but returns a new string by value instead of writing to the call...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00381">util.hpp:381</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_af030c3119f060a9630afca31098a78a5"><div class="ttname"><a href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">flow::util::Thread</a></div><div class="ttdeci">boost::thread Thread</div><div class="ttdoc">Short-hand for standard thread class.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00078">util_fwd.hpp:78</a></div></div>
<div class="ttc" id="anamespaceflow_html_a29eaaa9d0fac4ce87d8b969222dbed09"><div class="ttname"><a href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">flow::Error_code</a></div><div class="ttdeci">boost::system::error_code Error_code</div><div class="ttdoc">Short-hand for a boost.system error code (which basically encapsulates an integer/enum error code and...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00508">common.hpp:508</a></div></div>
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